Wastegate Oil Leak? (Pic Inside)

HifiSyd · 05-31-2013, 10:53 AM

After removing my belly-pan in preparation to install my 5" VRSF FMIC, I noticed a small amount of oil leaking down the outside of my bank 2 downpipe. When I looked up, I noticed a bit of oil on the underside of what I believe to be the wastegate actuator. On a side note, I noticed trace amounts of oil inside the hose joints of the stock FMIC as well.

Does anyone have any ideas of what may be causing this?

Car runs strong and is throwing no codes. How concerned should I be? Thanks in advance for the replies.

BMWM.D. · 05-31-2013, 08:42 PM

Kind of hard to tell from the pic, but it's probably coming out of the intake tube that feeds the rear turbo. Oil from the PCV system gets dumped into this tube, into the turbo, and eventually into the intercooler and pipes.

Could also be one of the oil lines seeping, or something above leaking down into that area (valve cover, filter housing, etc.). It can be tough to diagnose an oil leak without actually seeing the car.

pwr hungry · 05-31-2013, 11:47 PM

Do your best to follow the oil as far up and forward as possible. That will be where your leak is and then we can better help you out.

Beakmoney · 06-01-2013, 01:59 PM

Had the same type of leak....cracked valve cover.

Ch3ss · 06-01-2013, 02:24 PM

could also be a bad valve cover gasket.

HifiSyd · 06-01-2013, 09:45 PM

Thanks for the replies guys; I'll dig a bit deeper and see where it leads.

E90Company · 06-01-2013, 10:19 PM

The oil on top of the actuator is pretty much a clear giveaway that the oil is coming from above. As others have said, check your valve cover and gasket.

05-31-2013, 10:53 AM	#1
HifiSyd Enlisted Member 15 Rep 93 Posts Drives: 2007 335i Sedan Join Date: Dec 2010 Location: Edmond, Ok. iTrader: (0)	Wastegate Oil Leak? (Pic Inside) After removing my belly-pan in preparation to install my 5" VRSF FMIC, I noticed a small amount of oil leaking down the outside of my bank 2 downpipe. When I looked up, I noticed a bit of oil on the underside of what I believe to be the wastegate actuator. On a side note, I noticed trace amounts of oil inside the hose joints of the stock FMIC as well. Does anyone have any ideas of what may be causing this? Car runs strong and is throwing no codes. How concerned should I be? Thanks in advance for the replies. __________________ 2007 SGM e90 335i, Spt Pkg, Prem Pkg & Nav Mods: JB4 G4-Map 5, BMS DCI, 19" Reps on Hk V12s, SupremePower Lowering Perches, BMS Angel Eyes, VSFR DP & 5" FMIC. Last edited by HifiSyd; 05-31-2013 at 11:18 AM..
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05-31-2013, 08:42 PM	#2
BMWM.D. Stupid Idiot 134 Rep 827 Posts Drives: E90 335i & 6th Gen ZL1 Join Date: May 2009 Location: Santa Barbara iTrader: (1)	Kind of hard to tell from the pic, but it's probably coming out of the intake tube that feeds the rear turbo. Oil from the PCV system gets dumped into this tube, into the turbo, and eventually into the intercooler and pipes. Could also be one of the oil lines seeping, or something above leaking down into that area (valve cover, filter housing, etc.). It can be tough to diagnose an oil leak without actually seeing the car. __________________
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05-31-2013, 11:47 PM	#3
pwr hungry Banned 41 Rep 1,257 Posts Drives: 335 Join Date: Mar 2013 Location: Amer'ca iTrader: (2)	Do your best to follow the oil as far up and forward as possible. That will be where your leak is and then we can better help you out.
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06-01-2013, 01:59 PM	#4
Beakmoney Private 6 Rep 87 Posts Drives: Company car+07 335i Join Date: Aug 2012 Location: RI iTrader: (3)	Had the same type of leak....cracked valve cover.
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06-01-2013, 02:24 PM	#5
Ch3ss First Lieutenant 17 Rep 372 Posts Drives: E90 335i Join Date: Apr 2010 Location: CA iTrader: (7)	could also be a bad valve cover gasket.
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06-01-2013, 09:45 PM	#6
HifiSyd Enlisted Member 15 Rep 93 Posts Drives: 2007 335i Sedan Join Date: Dec 2010 Location: Edmond, Ok. iTrader: (0)	Thanks for the replies guys; I'll dig a bit deeper and see where it leads. __________________ 2007 SGM e90 335i, Spt Pkg, Prem Pkg & Nav Mods: JB4 G4-Map 5, BMS DCI, 19" Reps on Hk V12s, SupremePower Lowering Perches, BMS Angel Eyes, VSFR DP & 5" FMIC.
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06-01-2013, 10:19 PM	#7
E90Company Major General 194 Rep 6,136 Posts Drives: Car Join Date: Mar 2012 Location: FL iTrader: (2)	The oil on top of the actuator is pretty much a clear giveaway that the oil is coming from above. As others have said, check your valve cover and gasket.
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